/*
 * This file Copyright (c) 2015. Walle.
 * (http://www.wallellen.com). All rights reserved.
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 *
 * This file is dual-licensed under both the
 * Walle Agreement (WA) and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or WA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Walle Agreement (WA), this file
 * and the accompanying materials are made available under the
 * terms of the WA which accompanies this distribution, and
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 */

/**
 *
 */
package org.wltea.analyzer.sample;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.store.RAMDirectory;
import org.wltea.analyzer.lucene.IKAnalyzer;
import org.wltea.analyzer.lucene.IKQueryParser;
import org.wltea.analyzer.lucene.IKSimilarity;

import java.io.IOException;

/**
 * @author linly
 */
public class IKAnalyzerDemo {

    public static void main(String[] args) {
        //Lucene Document的域名
        String fieldName = "text";
        //检索内容
        String text = "IK Analyzer是一个结合词典分词和文法分词的中文分词开源工具包。它使用了全新的正向迭代最细粒度切分算法。";

        //实例化IKAnalyzer分词器
        Analyzer analyzer = new IKAnalyzer();


        Directory directory = null;
        IndexWriter iwriter = null;
        IndexSearcher isearcher = null;
        try {
            //建立内存索引对象
            directory = new RAMDirectory();
            iwriter = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED);
            Document doc = new Document();
            doc.add(new Field("ID", "10000", Field.Store.YES, Field.Index.NOT_ANALYZED));
            doc.add(new Field(fieldName, text, Field.Store.YES, Field.Index.ANALYZED));
            iwriter.addDocument(doc);
            iwriter.close();

            //实例化搜索器
            isearcher = new IndexSearcher(directory);
            //在索引器中使用IKSimilarity相似度评估器
            isearcher.setSimilarity(new IKSimilarity());

            String keyword = "中文分词工具包";

            //使用IKQueryParser查询分析器构造Query对象
            Query query = IKQueryParser.parse(fieldName, keyword);

            //搜索相似度最高的5条记录
            TopDocs topDocs = isearcher.search(query, 5);
            System.out.println("命中：" + topDocs.totalHits);
            //输出结果
            ScoreDoc[] scoreDocs = topDocs.scoreDocs;
            for (int i = 0; i < topDocs.totalHits; i++) {
                Document targetDoc = isearcher.doc(scoreDocs[i].doc);
                System.out.println("内容：" + targetDoc.toString());
            }

        } catch (CorruptIndexException e) {
            e.printStackTrace();
        } catch (LockObtainFailedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (isearcher != null) {
                try {
                    isearcher.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (directory != null) {
                try {
                    directory.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
